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import sys
import types
from collections.abc import MutableSequence
cdef class FrozenList:
if sys.version_info >= (3, 9):
__class_getitem__ = classmethod(types.GenericAlias)
else:
@classmethod
def __class_getitem__(cls):
return cls
cdef readonly bint frozen
cdef list _items
def __init__(self, items=None):
self.frozen = False
if items is not None:
items = list(items)
else:
items = []
self._items = items
cdef object _check_frozen(self):
if self.frozen:
raise RuntimeError("Cannot modify frozen list.")
cdef inline object _fast_len(self):
return len(self._items)
def freeze(self):
self.frozen = True
def __getitem__(self, index):
return self._items[index]
def __setitem__(self, index, value):
self._check_frozen()
self._items[index] = value
def __delitem__(self, index):
self._check_frozen()
del self._items[index]
def __len__(self):
return self._fast_len()
def __iter__(self):
return self._items.__iter__()
def __reversed__(self):
return self._items.__reversed__()
def __richcmp__(self, other, op):
if op == 0: # <
return list(self) < other
if op == 1: # <=
return list(self) <= other
if op == 2: # ==
return list(self) == other
if op == 3: # !=
return list(self) != other
if op == 4: # >
return list(self) > other
if op == 5: # =>
return list(self) >= other
def insert(self, pos, item):
self._check_frozen()
self._items.insert(pos, item)
def __contains__(self, item):
return item in self._items
def __iadd__(self, items):
self._check_frozen()
self._items += list(items)
return self
def index(self, item):
return self._items.index(item)
def remove(self, item):
self._check_frozen()
self._items.remove(item)
def clear(self):
self._check_frozen()
self._items.clear()
def extend(self, items):
self._check_frozen()
self._items += list(items)
def reverse(self):
self._check_frozen()
self._items.reverse()
def pop(self, index=-1):
self._check_frozen()
return self._items.pop(index)
def append(self, item):
self._check_frozen()
return self._items.append(item)
def count(self, item):
return self._items.count(item)
def __repr__(self):
return '<FrozenList(frozen={}, {!r})>'.format(self.frozen,
self._items)
def __hash__(self):
if self.frozen:
return hash(tuple(self._items))
else:
raise RuntimeError("Cannot hash unfrozen list.")
MutableSequence.register(FrozenList)